public class HomeWork03 {
	public static void main(String[] args){
		int year = 2020;
		if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0){
			System.out.println("是闰年");
		}else{
			System.out.println("不是闰年");
		}
	}
}